polspec
Declare a Polars schema once. Generate data that matches it, and validate data against it — from the same declaration.
Early alpha. The API, the YAML format, and the exact values a given seed produces are all still moving. See Roadmap and stability before depending on any of it.
import polars as pl
from polspec import ColSpec, FrameSpec
class Orders(FrameSpec):
order_id = ColSpec(pl.Int64, bounds=(1, None), unique=True)
status = ColSpec(pl.Enum(["NEW", "PAID", "SHIPPED"]))
total = ColSpec(pl.Float64, bounds=(0.0, None))
placed = ColSpec(pl.Date, nullable=True)
df = Orders.generate(1_000_000, seed=42) # a million rows in well under a second
Orders.validate(df) # raises ValidationError on any breach
A validation library tells you when production data drifted, and
Orders.drift(df) says what moved. A fixture library gives you something to
test against. Keeping both behind one declaration means the fixtures and the
contract cannot quietly disagree — and where they still can, it is written
down in
Known limitations,
each backed by a test that fails the moment it stops being true.
The generator is a Rust extension that fills columns in parallel; validate()
compiles every check across every column into a single Polars aggregation, so
validating a wide table costs about the same as a narrow one. Numbers, and
comparisons to NumPy and hand-written fixtures, are in
Comparison.
Install
uv add polspec # preferred
pip install polspec # alternative
Wheels are published for Linux (x86_64, aarch64), macOS (Intel and Apple silicon) and Windows (x86_64), so using polspec needs no Rust toolchain. Building from a checkout is covered in CONTRIBUTING.md.
Documentation
Full docs: maxwellb13.github.io/polspec
- Tutorial — Getting started · Related tables
- How-to — Declare columns · String formats · Constraints · Generate · Validate · Specs as files · Command line
- Reference — API · Errors and findings
- Explanation — Architecture · Generation and validation · Known limitations · Roadmap
Development
uv run pytest
uv run ruff check . && uv run ruff format --check .
cargo test && cargo clippy --all-targets -- -D warnings
uv run --group docs zensical build --strict
uv run python examples/related_specs.py
uv run --group bench python benchmarks/bench.py compare runs the generator
benchmark; record then check guard a change against a local baseline. See CONTRIBUTING.md for conventions and the
release process, and CHANGELOG.md for what changed.
License
MIT.
1 maintainer
Metadata
1 maintainer
Release files for polspec 0.11.0
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Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
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| polspec-0.11.0.tar.gz | 613.0 kB | With provenance | Details |
Built distributions (wheels)
| File | Reset | |||
|---|---|---|---|---|
| polspec-0.11.0-cp312-abi3-win_amd64.whl | CPython 3.12 | abi3 | Windows x86-64 | Details |
| polspec-0.11.0-cp312-abi3-manylinux_2_17_x86_64.manylinux2014_x86_64.whl | CPython 3.12 | abi3 | Linux glibc 2.17+ x86-64 | Details |
| polspec-0.11.0-cp312-abi3-manylinux_2_17_aarch64.manylinux2014_aarch64.whl | CPython 3.12 | abi3 | Linux glibc 2.17+ ARM64 | Details |
| polspec-0.11.0-cp312-abi3-macosx_11_0_arm64.whl | CPython 3.12 | abi3 | macOS 11.0+ ARM64 | Details |
| polspec-0.11.0-cp312-abi3-macosx_10_12_x86_64.whl | CPython 3.12 | abi3 | macOS 10.12+ x86-64 | Details |
Total release size: 29.9 MB
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